Multiple OpenSSL Vulnerabilities
— GLSA 200403-03

Three vulnerabilities have been found in OpenSSL via a commercial test
suite for the TLS protocol developed by Codenomicon Ltd.

Affected Packages

Package

dev-libs/openssl on all architectures

Affected versions

<= 0.9.7c

Unaffected versions

>= 0.9.7d= 0.9.6m

Background

The OpenSSL Project is a collaborative effort to develop a robust,
commercial-grade, full-featured, and Open Source toolkit implementing
the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS
v1) protocols as well as a full-strength general purpose cryptography
library.

Description

Testing performed by the OpenSSL group using the Codenomicon TLS Test
Tool uncovered a null-pointer assignment in the do_change_cipher_spec()
function. A remote attacker could perform a carefully crafted SSL/TLS
handshake against a server that used the OpenSSL library in such a way
as to cause OpenSSL to crash. Depending on the application this could
lead to a denial of service. All versions of OpenSSL from 0.9.6c to
0.9.6l inclusive and from 0.9.7a to 0.9.7c inclusive are affected by
this issue.

A flaw has been discovered in SSL/TLS handshaking code when using
Kerberos ciphersuites. A remote attacker could perform a carefully
crafted SSL/TLS handshake against a server configured to use Kerberos
ciphersuites in such a way as to cause OpenSSL to crash. Most
applications have no ability to use Kerberos cipher suites and will
therefore be unaffected. Versions 0.9.7a, 0.9.7b, and 0.9.7c of OpenSSL
are affected by this issue.

Testing performed by the OpenSSL group using the Codenomicon TLS Test
Tool uncovered a bug in older versions of OpenSSL 0.9.6 that can lead
to a Denial of Service attack (infinite loop). This issue was traced to
a fix that was added to OpenSSL 0.9.6d some time ago. This issue will
affect vendors that ship older versions of OpenSSL with backported
security patches.

Impact

Although there are no public exploits known for bug, users are
recommended to upgrade to ensure the security of their infrastructure.

Workaround

There is no immediate workaround; a software upgrade is required. The
vulnerable function in the code has been rewritten.

Resolution

All users are recommened to upgrade openssl to either 0.9.7d or 0.9.6m: